Remembering "Rowdy" Roddy Piper

Wrestling legend "Rowdy" Roddy Piper has died at the age of 61 ... TMZ Sports learned. Piper -- born Roderick George Toombs -- died from cardiac arrest in his sleep at his home in Hollywood on Thursday, July 30, 2015. He was discovered the following day.

Piper was a wrestling icon -- one of the biggest stars in the WWE back in the '80s, and even wrestled in "Wrestlemania I" back in 1985 ... squaring off against Hulk Hogan and Mr. T.